Suzanne Shaw turned to booze and pills to help her cope with the "traumatic" Hear'Say split.
The singer shot to fame after she landed a place in the pop group, alongside Danny Foster, Myleene Klass, Kym Marsh, and Noel Sullivan, on the TV reality show Popstars back in 2001.
The group enjoyed a stint at the top of the charts with their debut single Pure and Simple, and their subsequent album Popstars, however, Hear'Say disbanded shortly after Kym's departure in 2002.
Suzanne told The Sun she wasn't ready for the intense public scrutiny that came with being famous, and her dreams of superstardom quickly turned into a nightmare, and as she began a downward spiral, she turned to booze and pills to help her cope.
"My brain could not process the trauma and by the time the group split up, I didn't even realise I was suffering from mental health problems. Life as I knew it disappeared overnight and I had no support system in place," she explained.
"I would actually compare what happened to PTSD as the shock was so massive," Suzanne added.
The 39-year-old said the band was treated like guinea pigs, and nobody had any consideration for their mental health.
Following the group's split, she met actor Darren Day and the couple had a child together, son Corey, in 2004.
However, she was left in a lonely and dark place after suffering from post-natal depression, and with Darren subsequently ending their relationship, Suzanne confessed she was "in denial" about what was happening.
"I never wanted to be a single mum and I never wanted to feel like a failed pop star," she candidly shared.
The singer and actress is now back on track, and credited exercise and giving up alcohol with helping to improve her mental health.
She is currently engaged to Sam Greenfield and they share a five-year-old son.